Design and Implementation of Capture and Tracking Algorithm Based on Spread Spectrum Communication

In the missile-borne communication system, the mis-sile-borne target is in a highly dynamic environment. This paper uses direct sequence spread spectrum to adopt large frequency offset acquisition and high-dynamic tracking algorithms for high-speed moving targets to realize the communication between the missile-borne target and the ground control system. The large frequency offset capture algorithm captures the target signal by designing a matched filter, in which the filter coefficient is consistent with the equalized GOLD code used by the target. A high dynamic tracking loop is used to realize real-time tracking processing for the remaining frequency offset and the real-time speed change of the target after capture. The tracking loop is composed of a phase detector, a loop filter, and a local frequency oscillator. This paper designs the FPGA implementation method of the capture and tracking algorithm, and verifies the performance of the algorithm throgh simulation and hardware testing.